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help with this question....

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goncalo08 Junior | Next Rank: 30 Posts Default Avatar
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help with this question....

Post Sat Nov 18, 2006 5:29 pm
a circular jogging track forms the edge of a circular lake that has a diameter of 2 miles. johanna walked once around the track at the average of 3 miles per hour. it T represents the number of hours it took her to walk completly around the lake which of the following is correct

(a) 0.5 (b)1.75 c 2.0 d 2.5 e 3.0

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gmat_enthus Senior | Next Rank: 100 Posts Default Avatar
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Post Mon Nov 20, 2006 6:59 am
ditance travelled = 2*pi*1 miles ~ 6.28 miles

Average speed = 3 miles/hr

T ~ 6.28/3 = 2.08

Answer C

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gamemaster Senior | Next Rank: 100 Posts Default Avatar
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Post Sun Nov 19, 2006 7:23 am
the distance she has to walk is 2*pi*r = 2pi =~ a little more than 6 miles
she walk 3 miles in 1 hr ...

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